Question

A family travels for 3 hours at 55 miles per hour, then takes a 30 minute break, before continuing for 2 hours at 70 miles per hour. Calculate the total driving time, the distance traveled and the average speed.

Answer 1

3 hours at 55 miles per hour ;   165 miles traveled
2 hours at 70 miles per hour :      170 miles traveled

total driving time: 5 hours (2+3)
distance traveled: 335 miles ( 165+170)
average speed: 62.5 miles per hour [ ( 55 + 70 ) / 2 ]